Motor or pump mechanism having at least two distinct active cylinder capacities
US4724742A · kind A · utility
13Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1986 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Oct 16, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF03C1/045
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a hydraulic motor having an undulating cam and at least one large and one small selectable operating cylinder capacity. In the motor, cylinder feed orifices (41a, 42a) are distributed around the circumference of a circle about the axis of rotation (5), and the small cylinder capacity corresponds to an irregular angular distribution of active cylinder orifices (41a) which continue to be fed. This configuration makes it possible to provide a constant velocity motor with at least two different cylinder capacities and which is mechanically long-lasting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.